494
FNCA52 TJSJ 090730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST THU JUL 9 2026
DISCUSSION
LOCALIZED HEAVY RAINFALL OVER THE PAST SEVERAL DAYS HAS DONE
LITTLE TO IMPROVE THE BROADER FIRE WEATHER CONCERNS ACROSS
SOUTHERN AND EASTERN PUERTO RICO, VIEQUES, ST. CROIX, AND
ADJACENT AREAS, WHERE PERSISTENT RAINFALL DEFICITS, CRITICALLY
DRY FUELS, AND ELEVATED KBDI VALUES CONTINUE. A PROGRESSIVELY
DRIER-THAN- NORMAL AIR MASS MOVING INTO THE REGION TODAY,
MODERATE TO LOCALLY HIGH CONCENTRATIONS OF SAHARAN DUST, AND
BREEZY TO WINDY EASTERLY TRADE WINDS WILL SUPPORT INCREASINGLY
FAVORABLE CONDITIONS FOR WILDFIRE SPREAD THROUGH THE WEEKEND,
WITH THE GREATEST FIRE DANGER EXPECTED FRIDAY INTO THE WEEKEND. A
FIRE DANGER STATEMENT HAS BEEN ISSUED FOR PORTIONS OF SOUTHERN
PUERTO RICO TODAY, AND ADDITIONAL FIRE WEATHER PRODUCTS MAY BE
NEEDED OVER THE NEXT SEVERAL DAYS IF DRY AND WINDY CONDITIONS
PERSIST.
PRZ014-092000-
SOUTHEAST COASTAL PLAINS-
330 AM AST THU JUL 9 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE NONE
CHANCE PRECIP (%) 10 0 0
TEMP (24H TREND) 92 (+2) 75 (-1) 93
RH % (24H TREND) 50 (-8) 85 (-1) 44
WIND 20FT/EARLY(MPH) E 19 G28 E 16 G23 E 18 G27
WIND 20FT/LATE(MPH) E 21 G32 E 14 E 18 G27
MIXING HGT(FT-AGL/MSL)4910 4450
TRANSPORT WND (MPH) E 23 E 23
VENT RATE (KT-FT) 98200 89000
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-092000-
SOUTHERN HILLS-
330 AM AST THU JUL 9 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE NONE
CHANCE PRECIP (%) 10 0 0
TEMP (24H TREND) 88 (+3) 71 (-3) 90
RH % (24H TREND) 62 (-7) 94 (+2) 53
WIND 20FT/EARLY(MPH) E 18 E 18 E 16
WIND 20FT/LATE(MPH) E 20 E 16 E 16
MIXING HGT(FT-AGL/MSL)5330 4710
TRANSPORT WND (MPH) E 22 E 22
VENT RATE (KT-FT) 101270 89490
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-092000-
NORTH COASTAL PLAINS-
330 AM AST THU JUL 9 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 20 0 10
TEMP (24H TREND) 91 (+2) 75 (-2) 92
RH % (24H TREND) 61 (-9) 93 (+1) 56
WIND 20FT/EARLY(MPH) E 19 E 21 E 19
WIND 20FT/LATE(MPH) E 23 E 16 E 23
MIXING HGT(FT-AGL/MSL)5340 4420
TRANSPORT WND (MPH) E 23 E 23
VENT RATE (KT-FT) 106800 88400
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-092000-
NORTHERN HILLS-
330 AM AST THU JUL 9 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 10 0 10
TEMP (24H TREND) 90 (+3) 72 (-2) 91
RH % (24H TREND) 63 (-6) 94 (0) 56
WIND 20FT/EARLY(MPH) E 17 E 19 E 17
WIND 20FT/LATE(MPH) E 21 E 12 E 20
MIXING HGT(FT-AGL/MSL)6200 5310
TRANSPORT WND (MPH) E 20 E 18
VENT RATE (KT-FT) 105400 84960
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-092000-
WEST COAST-
330 AM AST THU JUL 9 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 20 0 10
TEMP (24H TREND) 93 (+2) 74 (-1) 94
RH % (24H TREND) 59 (-8) 94 (+4) 55
WIND 20FT/EARLY(MPH) E 17 E 17 E 17
WIND 20FT/LATE(MPH) E 18 E 12 SE 17
MIXING HGT(FT-AGL/MSL)3770 4230
TRANSPORT WND (MPH) E 17 E 13
VENT RATE (KT-FT) 56550 46530
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-092000-
EASTERN INTERIOR-
330 AM AST THU JUL 9 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 20 0 10
TEMP (24H TREND) 89 (+3) 73 (-2) 90
RH % (24H TREND) 64 (-5) 94 (0) 57
WIND 20FT/EARLY(MPH) E 19 E 18 E 17
WIND 20FT/LATE(MPH) E 19 E 18 E 17
MIXING HGT(FT-AGL/MSL)5700 4660
TRANSPORT WND (MPH) E 22 E 23
VENT RATE (KT-FT) 108300 93200
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-092000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST THU JUL 9 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 30 0 10
TEMP (24H TREND) 85 (+5) 71 (-2) 85
RH % (24H TREND) 70 (-10) 97 (0) 65
WIND 20FT/EARLY(MPH) E 19 E 17 E 14
WIND 20FT/LATE(MPH) E 19 E 14 E 14
MIXING HGT(FT-AGL/MSL)4650 4140
TRANSPORT WND (MPH) E 22 E 23
VENT RATE (KT-FT) 88350 82800
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-092000-
CENTRAL MOUNTAIN RANGE-
330 AM AST THU JUL 9 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE NONE
CHANCE PRECIP (%) 10 0 0
TEMP (24H TREND) 89 (+6) 69 (-3) 91
RH % (24H TREND) 65 (-9) 96 (+2) 55
WIND 20FT/EARLY(MPH) E 13 E 12 E 11
WIND 20FT/LATE(MPH) E 14 E 11 E 12
MIXING HGT(FT-AGL/MSL)6810 6260
TRANSPORT WND (MPH) E 16 E 15
VENT RATE (KT-FT) 95340 81380
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-092000-
CAYEY MOUNTAIN RANGE-
330 AM AST THU JUL 9 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 20 0 10
TEMP (24H TREND) 84 (+3) 70 (-3) 85
RH % (24H TREND) 72 (-5) 97 (-1) 64
WIND 20FT/EARLY(MPH) E 18 E 17 E 14
WIND 20FT/LATE(MPH) E 20 E 13 E 14
MIXING HGT(FT-AGL/MSL)5010 4330
TRANSPORT WND (MPH) E 23 E 24
VENT RATE (KT-FT) 100200 90930
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-092000-
VIEQUES-
330 AM AST THU JUL 9 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE NONE
CHANCE PRECIP (%) 10 0 0
TEMP (24H TREND) 90 (+2) 78 (-1) 89
RH % (24H TREND) 59 (-5) 85 (-2) 57
WIND 20FT/EARLY(MPH) E 19 E 20 E 19
WIND 20FT/LATE(MPH) E 19 E 20 E 19
MIXING HGT(FT-AGL/MSL)3390 4160
TRANSPORT WND (MPH) E 24 E 25
VENT RATE (KT-FT) 71190 91520
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-092000-
CULEBRA-
330 AM AST THU JUL 9 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE NONE
CHANCE PRECIP (%) 10 0 0
TEMP (24H TREND) 92 (+4) 78 (-2) 91
RH % (24H TREND) 60 (-8) 88 (+1) 58
WIND 20FT/EARLY(MPH) E 19 E 20 E 19
WIND 20FT/LATE(MPH) E 19 E 20 E 19
MIXING HGT(FT-AGL/MSL)3420 3720
TRANSPORT WND (MPH) E 24 E 23
VENT RATE (KT-FT) 71820 74400
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-092000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST THU JUL 9 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE NONE NONE
CHANCE PRECIP (%) 0 0 0
TEMP (24H TREND) 93 (+3) 76 (-1) 94
RH % (24H TREND) 49 (-9) 82 (+1) 46
WIND 20FT/EARLY(MPH) E 19 G29 E 20 G28 E 19 G30
WIND 20FT/LATE(MPH) E 23 G33 E 18 E 20 G30
MIXING HGT(FT-AGL/MSL)4860 4350
TRANSPORT WND (MPH) E 26 E 24
VENT RATE (KT-FT) 111780 91350
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-092000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST THU JUL 9 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE NONE NONE
CHANCE PRECIP (%) 0 0 0
TEMP (24H TREND) 88 (+2) 78 (-1) 88
RH % (24H TREND) 64 (-7) 88 (0) 62
WIND 20FT/EARLY(MPH) E 20 E 21 E 20
WIND 20FT/LATE(MPH) E 19 E 21 E 19
MIXING HGT(FT-AGL/MSL)3270 3530
TRANSPORT WND (MPH) E 25 E 25
VENT RATE (KT-FT) 71940 77660
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-092000-
ST CROIX-
330 AM AST THU JUL 9 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE NONE NONE
CHANCE PRECIP (%) 0 0 0
TEMP (24H TREND) 89 (+2) 77 (-2) 89
RH % (24H TREND) 63 (-6) 87 (-2) 61
WIND 20FT/EARLY(MPH) E 19 E 21 E 19
WIND 20FT/LATE(MPH) E 19 E 21 E 19
MIXING HGT(FT-AGL/MSL)4310 4400
TRANSPORT WND (MPH) E 26 E 28
VENT RATE (KT-FT) 99130 105600
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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